This bill, titled the All Stations Accessibility Program Reauthorization Act or ASAP Act, amends federal transportation law to establish a new competitive grant program. The program aims to assist State and local governmental authorities in financing capital projects to upgrade the accessibility of legacy rail fixed guideway public transportation systems for persons with disabilities. A "legacy rail fixed guideway public transportation system" is defined as one that was in operation before July 26, 1990, including commuter rail. Grants can be used for projects to repair, improve, modify, or relocate station infrastructure, as well as to develop accessibility plans, including assessments performed by disability advocacy organizations. The goal is to increase the number of existing stations and facilities that meet or exceed the new construction standards of Title II of the Americans with Disabilities Act of 1990. Recipients of these grants must commit to a plan that enhances the customer experience and maximizes accessibility for individuals with physical, sensory, intellectual, or developmental disabilities. This commitment also includes improving operations for disabled individuals and addressing equity of service for all riders, particularly those from underserved communities. The bill authorizes $350,000,000 annually from the Mass Transit Account of the Highway Trust Fund, starting in fiscal year 2027, with annual adjustments for inflation, and grants will cover up to 80 percent of project costs.